Battery cover plate and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises a cover plate body and a conductive unit, the cover plate body comprises a first mounting part and a second mounting part which are both solid flat plate structures, and a first capacity expansion part and a second capacity expansion part which are both hollow convex structures, the conductive unit comprises a first pole module and a second pole module, and the parts, exceeding the outer side of the cover plate body, of the first pole module and the second pole module are both lower than the height of the first capacity expansion part and the height of the second capacity expansion part. Therefore, on one hand, the space occupied due to the fact that the conductive units protrude out of the cover plate body is effectively utilized, the occupied space of the outer side is reduced, the battery module assembling rate is improved, protection is provided for the conductive units through the protruding first capacity expansion parts and the protruding second capacity expansion parts, damage caused by collision is avoided, and the battery module assembling efficiency is improved. On the other hand, the pole group utilizes the first capacity expansion part and the second capacity expansion part, so that the space utilization rate between the pole group and the cover plate body is improved, the size of the pole group is increased, and the battery capacity is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery cover and a battery. Background Technology

[0002] As a crucial component of lithium batteries, the battery cover's structural design not only affects the battery's basic performance (such as capacity and charge / discharge efficiency) but also directly relates to its safety and long-term reliability. The main components of the battery cover include conductive electrode posts, a plain aluminum plate, riveting blocks, outer insulation components, inner insulation components, sealing components, and explosion-proof valves.

[0003] Currently, traditional battery cover plates typically have a flat aluminum plate structure. One end of the conductive electrode post passes through the aluminum plate and is connected to it via a rivet block, with an external insulating component between the rivet block and the aluminum plate for insulation protection; the other end is located on the other side of the aluminum plate and is welded to the electrode lug of the electrode assembly, while an internal insulating component provides insulation protection between the conductive electrode post and the aluminum plate.

[0004] This structure leads to two problems after the traditional battery cover is assembled, because the aluminum plate is flat: First, the rivet blocks and outer insulation parts on the outside of the aluminum plate protrude from the plate surface due to the stacked installation, occupying additional external space and affecting the assembly rate of the battery module; Second, the conductive electrode posts and inner insulation parts on the other side of the aluminum plate also protrude from the plate surface, occupying internal space, resulting in low space utilization between the electrode group and the aluminum plate, limiting the volume of the electrode group, and thus reducing the battery capacity. Summary of the Invention

[0005] The purpose of this invention is to provide a battery cover and a battery that not only saves assembly space for the battery module and increases the assembly rate of the battery module, but also improves the utilization rate of internal space, increases the volume of the electrode assembly, and enhances the battery capacity.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On one hand, a battery cover is provided, the battery cover comprising:

[0008] The cover plate body includes a first mounting part, a second mounting part, a first expansion part, and a second expansion part. The first mounting part and the second mounting part are both solid flat plate structures. The included angle between the first mounting part and the second mounting part toward the pole group is an obtuse angle. The first expansion part is disposed between the first mounting part and the second mounting part. The second expansion part is disposed on the side of the first mounting part away from the first expansion part. The first expansion part and the second expansion part are both hollow protrusion structures formed by the cover plate body protruding from the inner side toward the pole group to the outer side away from the pole group.

[0009] The conductive unit includes a first electrode module and a second electrode module. The first electrode module is insulated from the first mounting portion, and the second electrode module is insulated from the second mounting portion. The portions of the first electrode module and the second electrode module that extend beyond the outer side of the cover plate body are both lower than the heights of the first expansion portion and the second expansion portion.

[0010] Optionally, the cover plate body further includes a connecting portion, which is parallel to the first mounting portion and located on the side of the second mounting portion away from the first expansion portion;

[0011] The distance between the surface of the connecting part away from the electrode group and the surface of the first expansion part away from the electrode group along the first direction is A, and the height of the second expansion part along the first direction is H1, and the distance satisfies 20mm≤A-H1≤50mm.

[0012] Optionally, the distance between the surface of the first mounting portion away from the electrode group and the surface of the first expansion portion away from the electrode group along the first direction is H2, and satisfies 6.5mm≤H2≤15mm.

[0013] Optionally, the length of the portion of the first pole module extending beyond the outer side of the cover plate body along the second direction is L1, and the length of the portion of the second pole module extending beyond the outer side of the cover plate body along the second direction is L2, and the length satisfies 40mm≤L1+L2≤130mm.

[0014] Optionally, the shortest distance between the junction of the second mounting part and the first expansion part and the second pole module is L3, and satisfies 13.5mm≤L3≤22mm.

[0015] Optionally, the angle between the first mounting portion and the second mounting portion toward the pole group is N, and satisfies 125°≤N≤145°.

[0016] Optionally, the first expansion portion includes a first top protective plate parallel to the first mounting portion and a first side protective plate surrounding the first top protective plate. The second expansion portion includes a second top protective plate parallel to the first mounting portion and a second side protective plate surrounding the second top protective plate. The thickness of the first top protective plate and the second top protective plate is T1, and the thickness of the first side protective plate and the second side protective plate is T2, satisfying 0.5≤T2 / T1≤0.9.

[0017] Optionally, the cover plate body has an insertion protrusion with the same outline as the cover plate body on the inner side facing the pole group.

[0018] Optionally, the first pole module and the second pole module have the same polarity;

[0019] Alternatively, the first electrode module and the second electrode module may have different polarities.

[0020] On the other hand, a battery is provided, the battery including an electrode assembly, a battery housing and a battery cover as described in any of the preceding claims, the battery housing being a hollow housing structure having at least one opening, and the battery cover being disposed at the opening of the battery housing to close the battery housing and form a receiving cavity for accommodating the electrode assembly.

[0021] The beneficial effects of this invention are:

[0022] This invention provides a battery cover plate. The cover plate body is designed with a first mounting portion and a second mounting portion having specific included angles, and a first expansion portion and a second expansion portion with two hollow protruding structures. The portions of the first and second terminal modules extending beyond the cover plate body are all lower than the height of the first and second expansion portions. This effectively utilizes the space previously occupied by the protruding first and second terminal modules, reducing the space occupied on the outer side of the battery cover plate and increasing the battery module assembly rate. Furthermore, the protruding first and second expansion portions provide protection for the first and second terminal modules, preventing damage from impacts. On the other hand, because the first and second expansion portions are hollow protruding structures, the electrode assembly utilizes the space inside the first and second expansion portions, improving the space utilization between the electrode assembly and the cover plate body, increasing the electrode assembly volume, and ultimately increasing the battery capacity.

[0023] The present invention also provides a battery that, by applying the aforementioned battery cover, not only reduces the external space occupied but also expands the internal space, thereby increasing the volume of the electrode assembly and enhancing the power supply capacity. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the top structure of the battery cover provided by the present invention;

[0025] Figure 2 This is a schematic diagram of the bottom structure of the battery cover provided by the present invention;

[0026] Figure 3 This is a structural cross-sectional view of the battery cover plate provided by the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of the cover body in the battery cover provided by the present invention;

[0028] Figure 5 This is a partial structural diagram of a battery using the aforementioned battery cover provided by the present invention;

[0029] Figure 6 This is a partial structural cross-sectional view of a battery using the aforementioned battery cover plate provided by the present invention.

[0030] In the picture:

[0031] 100. Electrode assembly; 101. First protrusion; 102. Second protrusion; 103. Angled portion; 200. Battery casing;

[0032] 1. Cover plate body; 11. First mounting part; 12. Second mounting part; 13. First expansion part; 131. First top protective plate; 132. First side protective plate; 14. Second expansion part; 141. Second top protective plate; 142. Second side protective plate; 15. Connecting part; 16. Insertion protrusion; 17. Through hole for pole post;

[0033] 2. Conductive unit; 21. First pole module; 211. First pole; 212. First riveting block; 213. First outer insulating component; 214. First inner insulating component; 22. Second pole module; 221. Second pole; 222. Second riveting block; 223. Second outer insulating component; 224. Second inner insulating component. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0035] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0038] Because traditional battery covers have flat aluminum plates, the rivet blocks and outer insulation components on the outside of the aluminum plate protrude from the plate surface due to stacking, resulting in additional external space occupation and affecting the battery module assembly rate. On the other hand, the conductive electrode posts and inner insulation components on the other side of the aluminum plate also protrude from the plate surface, occupying internal space. This leads to low space utilization between the electrode assembly and the aluminum plate, limiting the electrode assembly volume and thus reducing battery capacity.

[0039] Therefore, in order to reduce the space occupied by the battery cover in the external and internal spaces, improve the battery module assembly rate, and increase battery capacity, this embodiment provides a battery cover. For ease of description, the thickness direction of the battery cover is defined as the first direction, and the length direction of the battery cover is defined as the second direction.

[0040] like Figures 1 to 6As shown, the battery cover includes a cover body 1 and a conductive unit 2. The cover body 1 includes a first mounting portion 11, a second mounting portion 12, a first expansion portion 13, and a second expansion portion 14. The first mounting portion 11 and the second mounting portion 12 are both solid flat plate structures. The angle between the first mounting portion 11 and the second mounting portion 12 toward the electrode assembly 100 is an obtuse angle. The first expansion portion 13 is disposed between the first mounting portion 11 and the second mounting portion 12. The second expansion portion 14 is disposed on the side of the first mounting portion 11 away from the first expansion portion 13. Both expansion section 13 and expansion section 14 are hollow protrusion structures formed by the inner side of the cover plate body 1 protruding towards the outer side away from the electrode group 100. The conductive unit 2 includes a first electrode module 21 and a second electrode module 22. The first electrode module 21 is insulated from the first mounting part 11, and the second electrode module 22 is insulated from the second mounting part 12. The portions of the first electrode module 21 and the second electrode module 22 that extend beyond the outer side of the cover plate body 1 are both lower than the height of the first expansion section 13 and the second expansion section 14.

[0041] This battery cover design incorporates a cover body 1 with a first mounting portion 11 and a second mounting portion 12 at specific angles, as well as two hollow protruding expansion portions 13 and 14. Furthermore, the portions of the first terminal module 21 and the second terminal module 22 extending beyond the outer side of the cover body 1 are all lower than the height of the first expansion portions 13 and 14. This effectively utilizes the space previously occupied by the protruding first terminal module 21 and second terminal module 22, reducing the size of the battery cover. The external space occupies space, which increases the battery module assembly rate. The protruding first expansion portion 13 and second expansion portion 14 provide protection for the first terminal module 21 and the second terminal module 22, avoiding damage caused by bumps. On the other hand, since the first expansion portion 13 and the second expansion portion 14 are hollow protruding structures, the electrode group 100 can improve the space utilization between the electrode group 100 and the cover plate body 1 by utilizing the space inside the first expansion portion 13 and the second expansion portion 14, thereby increasing the volume of the electrode group 100 and improving the battery capacity.

[0042] In this embodiment, the first pole module 21 includes a first pole 211, a first riveting block 212, a first outer insulating member 213, and a first inner insulating member 214. The first pole 211 includes a first column portion and a first plate portion. The first column portion passes through the first mounting portion 11 and is riveted to the first riveting block 212. The first column portion is perpendicular to the first mounting portion 11. The first outer insulating member 213 is disposed between the first riveting block 212 and the first mounting portion 11. The first inner insulating member 214 is disposed between the first plate portion and the first mounting portion 11. Between them, the first plate body is used to weld with the electrode lug of the electrode group 100. Therefore, the part of the first electrode post module 21 that extends beyond the outer side of the cover plate body 1 is the total height of the first riveting block 212 and the first outer insulating member 213. The projection of the first riveting block 212 and the first outer insulating member 213 on the first mounting part 11 does not exceed the first mounting part 11, thereby avoiding damage in the event of a collision. In order to increase the contact area between the first post body and the first riveting block 212 and increase the flow area, the cross section of the first post body is elliptical.

[0043] The second pole post module 22 includes a second pole post 221, a second riveting block 222, a second outer insulating component 223, and a second inner insulating component 224. The second pole post 221 includes a second column portion and a second plate portion. The second column portion passes through the second mounting portion 12 and is riveted to the second riveting block 222. The second column portion is perpendicular to the second mounting portion 12. The second outer insulating component 223 is disposed between the second riveting block 222 and the second mounting portion 12. The second inner insulating component 224 is disposed between the second plate portion and the second mounting portion 12. The body is used for welding to the tabs of the electrode assembly 100. Therefore, the portion of the second electrode post module 22 that extends beyond the outer side of the cover plate body 1 is the total height of the second riveting block 222 and the second outer insulating member 223. The projections of the second riveting block 222 and the second outer insulating member 223 onto the second mounting portion 12 do not exceed the second mounting portion 12, thereby preventing damage in the event of an impact. Furthermore, to increase the contact area between the second post and the second riveting block 222 and improve the flow area, the cross-section of the second post is elliptical. In addition, as... Figure 4 As shown, both the first mounting part 11 and the second mounting part 12 are provided with pole post through holes 17 for insertion of the first column part and the second column part.

[0044] Optionally, such as Figure 3 As shown, the cover body 1 also includes a connecting part 15, which is parallel to the first mounting part 11 and located on the side of the second mounting part 12 away from the first expansion part 13.

[0045] The distance between the surface of the connecting part 15 away from the electrode group 100 and the surface of the first expansion part 13 away from the electrode group 100 along the first direction is A, and the height of the second expansion part 14 along the first direction is H1, and the conditions are met: 20mm≤A-H1≤50mm.

[0046] By providing a connecting portion 15 parallel to the first mounting portion 11 on the side of the second mounting portion 12 away from the first expansion portion 13, it is convenient to assemble it with the battery casing 200 via the connecting portion 15. Furthermore, by limiting the difference between the distance A along the first direction between the surface of the connecting portion 15 away from the electrode group 100 and the surface of the first expansion portion 13 away from the electrode group 100, and the height H1 along the first direction of the second expansion portion 14, the height difference of the second mounting portion 12 is essentially limited. By ensuring that it satisfies 20mm≤A-H1≤50mm, while maintaining a constant distance A, on the one hand, it avoids the second mounting portion 12 being too small, which would prevent it from providing sufficient mounting area for the second electrode module 22, thus limiting the size of the second riveting block 222 and reducing the current carrying capacity. On the other hand, it avoids the second mounting portion 12 being too large, which would result in an excessively large angled area of ​​the electrode group 100 to accommodate the second mounting portion 12, thus reducing the size of the electrode group 100 and lowering the battery capacity.

[0047] The difference between the distance A between the surface of the connecting part 15 away from the electrode group 100 and the surface of the first expansion part 13 away from the electrode group 100 along the first direction and the height H1 of the second expansion part 14 along the first direction can be any value between 20mm and 50mm or any range between two values, such as 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc.

[0048] Optionally, such as Figure 3 As shown, the distance between the surface of the first mounting portion 11 away from the electrode group 100 and the surface of the first expansion portion 13 away from the electrode group 100 along the first direction is H2, and satisfies 6.5mm≤H2≤15mm. By limiting the distance H2 between the surface of the first mounting portion 11 away from the electrode group 100 and the surface of the first expansion portion 13 away from the electrode group 100 along the first direction, it is possible to avoid the distance H2 being too small, which would cause the first riveting block 212 to be too close to the outer contour of the battery cover, increasing the probability of damage due to impact. On the other hand, it is also possible to avoid the distance H2 being too large, which would cause the groove depth formed by the first mounting portion 11, the first expansion portion 13 and the second expansion portion 14 to be too large, thereby increasing the difficulty of riveting the first riveting block 212 and the first column portion.

[0049] The distance H2 between the surface of the first mounting part 11 away from the electrode group 100 and the surface of the first expansion part 13 away from the electrode group 100 along the first direction can be any value between 6.5mm and 15mm or any range between two values, such as 6.5mm, 7.5mm, 8.5mm, 9.5mm, 10.5mm, 11.5mm, 12.5mm, 13.5mm, 14.5mm, 15mm, etc.

[0050] In this embodiment, to verify the impact of the above parameter limitations on the battery cover provided in this embodiment, as shown in Table 1, six sets of embodiments and four sets of comparative examples are provided for verification.

[0051] Table 1

[0052]

[0053] A comparison of Examples 1 to 6 with Comparative Examples 1 to 2 shows that when the difference between the distance A along the first direction between the surface of the connecting part 15 away from the electrode group 100 and the surface of the first expansion part 13 away from the electrode group 100 and the height H1 along the first direction of the second expansion part 14 is less than the minimum value of 20mm ≤ A - H1 ≤ 50mm, the height difference of the second mounting part 12 is too small, resulting in insufficient mounting area for the second pole post module 22, thereby limiting the second riveting block 22. The size of the second mounting part 12 is reduced, which reduces the overcurrent capacity. When the difference between the distance A between the surface of the connecting part 15 away from the electrode group 100 and the surface of the first expansion part 13 away from the electrode group 100 along the first direction and the height H1 of the second expansion part 14 along the first direction is greater than the maximum value of 20mm≤A-H1≤50mm, the height difference of the second mounting part 12 is too large. This results in the electrode group 100 having an excessively large angled area in order to adapt to the second mounting part 12, thereby reducing the size of the electrode group 100 and reducing the battery capacity.

[0054] A comparison of Examples 1 to 6 with Comparative Examples 3 to 4 reveals that when the distance H2 between the surface of the first mounting portion 11 away from the electrode group 100 and the surface of the first expansion portion 13 away from the electrode group 100 along the first direction is less than the minimum value of 6.5mm ≤ H2 ≤ 15mm, the distance H2 is too small, causing the first riveting block 212 to be too close to the outer contour of the battery cover, increasing the probability of damage due to impact. When the distance H2 between the surface of the first mounting portion 11 away from the electrode group 100 and the surface of the first expansion portion 13 away from the electrode group 100 along the first direction is greater than the maximum value of 6.5mm ≤ H2 ≤ 15mm, the distance H2 is too large, resulting in an excessively deep groove formed by the first mounting portion 11, the first expansion portion 13, and the second expansion portion 14, thereby increasing the difficulty of riveting the first riveting block 212 and the first column portion.

[0055] Optionally, such as Figure 3As shown, the length of the portion of the first terminal module 21 extending beyond the outer side of the cover body 1 along the second direction is L1, and the length of the portion of the second terminal module 22 extending beyond the outer side of the cover body 1 along the second direction is L2, satisfying 40mm≤L1+L2≤130mm. By limiting the sum of the length L1 of the portion of the first terminal module 21 extending beyond the outer side of the cover body 1 along the second direction and the length L2 of the portion of the second terminal module 22 extending beyond the outer side of the cover body 1 along the second direction, on the one hand, the area used for current flow is avoided from being too small, thereby reducing the current flow capacity. On the other hand, since the first terminal module 21 and the second terminal module 22 are connected to the cover body 1 by riveting, if the sum of the lengths L1 and L2 is too large, the proportion of the first terminal module 21 and the second terminal module 22 relative to the cover body 1 will be too large, which will easily cause deformation of the cover body 1 during riveting, thus affecting the flatness of the battery cover after molding.

[0056] In this embodiment, since the portion of the first pole post module 21 extending beyond the outer side of the cover plate body 1 mainly consists of the first riveting block 212 and the first outer insulating component 213, and the wall thickness of the first outer insulating component 213 is relatively small, the length L1 of the portion of the first pole post module 21 extending beyond the outer side of the cover plate body 1 along the second direction essentially represents the length of the first riveting block 212 in the second direction. Since the portion of the second pole post module 22 extending beyond the outer side of the cover plate body 1 mainly consists of the second riveting block 222 and the second outer insulating component 223, and the wall thickness of the second outer insulating component 223 is relatively small, the length L2 of the portion of the second pole post module 22 extending beyond the outer side of the cover plate body 1 along the second direction essentially represents the length of the second riveting block 222 in the second direction.

[0057] The sum of the length L1 of the portion of the first pole post module 21 extending beyond the outer side of the cover plate body 1 along the second direction and the length L2 of the portion of the second pole post module 22 extending beyond the outer side of the cover plate body 1 along the second direction can be any value between 40mm and 130mm or any range between two values, such as 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, etc.

[0058] Optionally, such as Figure 3As shown, the shortest distance between the junction of the second mounting part 12 and the first expansion part 13 and the second pole post module 22 is L3, and satisfies 13.5mm≤L3≤22mm. Because the first expansion part 13 is a hollow protrusion structure formed by the cover plate body 1 protruding from the inside towards the pole post 100 to the outside away from the pole post 100 in order to increase the volume of the pole group 100, a portion of the pole group 100 is inserted into the first expansion part 13. Furthermore, to avoid interference between the portion of the pole group 100 inserted into the first expansion part 13 and the second pole post module 22 during assembly, a certain gap needs to be maintained between them. Therefore, by adjusting the distance between the junction of the second mounting part 12 and the first expansion part 13 and the second pole post module 22... The minimum distance L3 between the diode modules 22 is limited to prevent the distance L3 from being too small, which would result in the electrode group 100 inserted into the first expansion part 13 being too small and having too low strength, making it easy to be damaged by external forces. On the other hand, the distance L3 is also prevented from being too large, which would result in insufficient installation area for the second diode module 22 given that the size of the second mounting part 12 is fixed, thus reducing the size of the second diode module 22 and reducing its current carrying capacity.

[0059] The shortest distance L3 between the junction of the second mounting part 12 and the first expansion part 13 and the second pole module 22 can be any value between 13.5mm and 22mm or any range between two values, such as 13.5mm, 14.5mm, 15.5mm, 16.5mm, 17.5mm, 18.5mm, 19.5mm, 20.5mm, 21.5mm, 22mm, etc.

[0060] In this embodiment, to verify the impact of the above parameter limitations on the battery cover provided in this embodiment, as shown in Table 2, six sets of embodiments and four sets of comparative examples are provided for verification.

[0061] Table 2

[0062]

[0063] A comparison of Examples 7 to 12 with Comparative Examples 5 to 6 reveals that when the sum of the length L1 of the portion of the first terminal module 21 extending beyond the outer side of the cover plate body 1 along the second direction and the length L2 of the portion of the second terminal module 22 extending beyond the outer side of the cover plate body 1 along the second direction is less than the minimum value of 40mm ≤ L1 + L2 ≤ 130mm, the area used for current flow is too small, thereby reducing the current flow capacity and failing to meet the battery's current flow requirements. When the sum of the length L1 of the portion of the first terminal module 21 extending beyond the outer side of the cover plate body 1 along the second direction and the length L2 of the portion of the second terminal module 22 extending beyond the outer side of the cover plate body 1 along the second direction is greater than the maximum value of 40mm ≤ L1 + L2 ≤ 130mm, the proportion of the first terminal module 21 and the second terminal module 22 relative to the cover plate body 1 is too large, which can easily cause deformation of the cover plate body 1 during riveting, resulting in a flatness greater than 0.3 after riveting, making it inconvenient to weld with the battery plate later.

[0064] A comparison of Examples 7 to 12 with Comparative Examples 7 to 8 reveals that when the shortest distance L3 between the junction of the second mounting portion 12 and the first expansion portion 13 and the second terminal module 22 is less than the minimum value of 13.5mm ≤ L3 ≤ 22mm, the portion of the electrode assembly 100 inserted into the first expansion portion 13 is too small and has too low strength, thus causing damage due to external forces. When the shortest distance L3 between the junction of the second mounting portion 12 and the first expansion portion 13 and the second terminal module 22 is greater than the maximum value of 13.5mm ≤ L3 ≤ 22mm, given a fixed size of the second mounting portion 12, it is impossible to provide sufficient mounting area for the second terminal module 22, resulting in a reduction in the size of the second terminal module 22, thereby reducing the current carrying capacity of the second terminal module 22 and making the overall current carrying capacity of the battery poor.

[0065] Optionally, such as Figure 3 As shown, the included angle N between the first mounting portion 11 and the second mounting portion 12 toward the electrode group 100 satisfies 125°≤N≤145°. By limiting the included angle N between the first mounting portion 11 and the second mounting portion 12 toward the electrode group 100 to satisfy 125°≤N≤145°, on the one hand, it avoids the included angle N being too small, causing the second mounting portion 12 to bend excessively toward the electrode group 100, thereby reducing the external dimensions of the electrode group 100 and reducing the battery capacity. On the other hand, it avoids the included angle N being too large, causing the second mounting portion 12 to bend excessively away from the electrode group 100, thereby causing the second electrode module 22 to be too close to the top of the first expansion portion 13, increasing the probability of the second electrode module 22 being damaged by impact.

[0066] The included angle N between the first mounting part 11 and the second mounting part 12 toward the pole group 100 can be any value between 125° and 145° or any range between two values, such as 125°, 130°, 140°, 145°, etc.

[0067] Optionally, such as Figure 3 As shown, the first expansion section 13 includes a first top protective plate 131 parallel to the first mounting section 11 and a first side protective plate 132 surrounding the first top protective plate 131. The second expansion section 14 includes a second top protective plate 141 parallel to the first mounting section 11 and a second side protective plate 142 surrounding the second top protective plate 141. The thickness of the first top protective plate 131 and the second top protective plate 141 is T1, and the thickness of the first side protective plate 132 and the second side protective plate 142 is T2, and satisfies 0.5≤T2 / T1≤0.9. Since both the first expansion section 13 and the second expansion section 14 are formed by stamping and stretching, the first side protective plate 132 and the second side protective plate 142 surrounding the first top protective plate 131 and the second top protective plate 141 on the first expansion section 13 and the second expansion section 14 will become thinner due to stretching during forming. Meanwhile, the thickness of the first top protective plate 131 and the second top protective plate 141 will be approximately equal to the plate thickness before forming. Therefore, by limiting the ratio between the thickness dimension T2 and the thickness dimension T1 to satisfy 0.5≤T2 / T1≤0.9, the first side... The front protective plate 132 and the second side protective plate 142 are too thin relative to the first top protective plate 131 and the second top protective plate 141, resulting in poor structural strength of the first side protective plate 132 and the second side protective plate 142. This makes it impossible to provide effective protection for the pole assembly 100 inserted into the first expansion part 13 and the second expansion part 14, thus increasing the probability of damage due to impact. On the other hand, it avoids the first side protective plate 132 being too thick relative to the first top protective plate 131 and the second side protective plate 142 being too thick relative to the second top protective plate 141, thereby increasing the difficulty of molding.

[0068] The ratio between thickness dimension T2 and thickness dimension T1 can be any value between 0.5 and 0.9 or any range between any two values, such as 0.5, 0.6, 0.7, 0.8, 0.9, etc.

[0069] In this embodiment, to verify the impact of the above parameter limitations on the battery cover provided in this embodiment, as shown in Table 3, six sets of embodiments and four sets of comparative examples are provided for verification.

[0070] Table 3

[0071]

[0072] A comparison of Examples 13 to 18 with Comparative Examples 9 to 10 reveals that when the ratio between thickness dimension T2 and thickness dimension T1 is less than the minimum value of 0.5 ≤ T2 / T1 ≤ 0.9, the first side protective plate 132 and the second side protective plate 142 are too thin, resulting in poor structural strength and inability to provide effective protection for the pole group 100 inserted into the first expansion part 13 and the second expansion part 14, leading to damage due to impact. When the ratio between thickness dimension T2 and thickness dimension T1 is greater than the maximum value of 0.5 ≤ T2 / T1 ≤ 0.9, the first side protective plate 132 and the second side protective plate 142 are too thick relative to their respective first top protective plate 131 and second top protective plate 141, increasing the difficulty of molding and resulting in substandard dimensions after molding.

[0073] A comparison of Examples 13 to 18 with Comparative Examples 11 to 12 reveals that when the angle N between the first mounting portion 11 and the second mounting portion 12 toward the electrode group 100 is less than the minimum value of 125°≤N≤145°, the second mounting portion 12 bends excessively toward the electrode group 100, thereby reducing the external dimensions of the electrode group 100, lowering the battery capacity, and causing the battery's power supply capacity to fail to meet the demand. When the angle N between the first mounting portion 11 and the second mounting portion 12 toward the electrode group 100 is greater than the maximum value of 125°≤N≤145°, the second mounting portion 12 bends excessively toward the direction away from the electrode group 100, causing the second electrode module 22 to be too close to the top of the first expansion portion 13, resulting in damage to the second electrode module 22 due to impact.

[0074] Optionally, such as Figure 4 As shown, the inner side of the cover plate body 1 facing the electrode group 100 is provided with an insertion protrusion 16 that has the same outline as the cover plate body 1. By providing an insertion protrusion 16 that has the same outline as the cover plate body 1 on the inner side of the cover plate body 1 facing the electrode group 100, the cover plate body 1 can be assembled by inserting it into the battery housing 200, thereby facilitating subsequent welding operations.

[0075] In this embodiment, the outline of the cover plate body 1 is the shape of the cover plate body 1 after it is formed by stamping and stretching to form the first mounting part 11, the second mounting part 12, the first expansion part 13 and the second expansion part 14.

[0076] Optionally, the first pole module 21 and the second pole module 22 have the same polarity; or, the first pole module 21 and the second pole module 22 have different polarities.

[0077] By making the polarities of the first terminal module 21 and the second terminal module 22 the same or different, the battery cover can be adapted to different types of batteries. When the polarities of the first terminal module 21 and the second terminal module 22 are the same, it is adapted to a blade battery. When the polarities of the first terminal module 21 and the second terminal module 22 are different, it is adapted to a box battery.

[0078] In this embodiment, since the blade battery has a structure with tabs on both sides of the electrode group 100, it is provided with two battery covers. Therefore, two types of blade batteries can be derived by combining the battery covers provided in this embodiment. One type has two battery covers of the same type as the battery cover provided in this embodiment, and the other type has one battery cover of the same type as the battery cover provided in this embodiment, while the other retains the traditional battery cover type.

[0079] In this embodiment, as Figures 5 to 6 As shown, a battery is also provided, comprising an electrode assembly 100, a battery casing 200, and a battery cover plate according to this embodiment. The battery casing 200 is a hollow casing structure with at least one opening. The battery cover plate is disposed at the opening of the battery casing 200, closing the battery casing 200 to form a receiving cavity for accommodating the electrode assembly 100. By using the aforementioned battery cover plate, this battery not only reduces the external space occupied but also expands the internal space, increasing the volume of the electrode assembly 100 and thereby enhancing the power supply capacity.

[0080] In order to adapt to the battery cover provided in this embodiment, the shape of the battery housing 200 is adapted to the shape of the battery cover. The electrode assembly 100 is provided with a first protrusion 101 inserted into the first expansion part 13, a second protrusion 102 inserted into the second expansion part 14, and an angled part 103 corresponding to the second mounting part 12.

[0081] In this embodiment, in order to ensure the safety of the battery, an explosion-proof valve is also provided on the battery. The explosion-proof valve can be provided on the battery housing 200, or on the first expansion portion 13 or the second expansion portion 14 of the battery cover provided in this embodiment.

[0082] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cover, characterized in that, The battery cover includes: The cover plate body includes a first mounting part, a second mounting part, a first expansion part, and a second expansion part. The first mounting part and the second mounting part are both solid flat plate structures. The included angle between the first mounting part and the second mounting part toward the pole group is an obtuse angle. The first expansion part is disposed between the first mounting part and the second mounting part. The second expansion part is disposed on the side of the first mounting part away from the first expansion part. The first expansion part and the second expansion part are both hollow protrusion structures formed by the cover plate body protruding from the inner side toward the pole group to the outer side away from the pole group. The conductive unit includes a first electrode module and a second electrode module. The first electrode module is insulated from the first mounting portion, and the second electrode module is insulated from the second mounting portion. The portions of the first electrode module and the second electrode module that extend beyond the outer side of the cover plate body are both lower than the heights of the first expansion portion and the second expansion portion.

2. The battery cover according to claim 1, characterized in that, The cover plate body also includes a connecting part, which is parallel to the first mounting part and located on the side of the second mounting part away from the first expansion part; The distance between the surface of the connecting part away from the electrode group and the surface of the first expansion part away from the electrode group along the first direction is A, and the height of the second expansion part along the first direction is H1, and the distance satisfies 20mm≤A-H1≤50mm.

3. The battery cover according to claim 1, characterized in that, The distance between the surface of the first mounting part away from the electrode group and the surface of the first expansion part away from the electrode group along the first direction is H2, and satisfies 6.5mm≤H2≤15mm.

4. The battery cover according to claim 1, characterized in that, The length of the portion of the first pole post module extending beyond the outer side of the cover plate body along the second direction is L1, and the length of the portion of the second pole post module extending beyond the outer side of the cover plate body along the second direction is L2, and both satisfy 40mm≤L1+L2≤130mm.

5. The battery cover according to claim 1, characterized in that, The shortest distance between the junction of the second mounting part and the first expansion part and the second pole module is L3, and satisfies 13.5mm≤L3≤22mm.

6. The battery cover according to claim 1, characterized in that, The angle between the first mounting portion and the second mounting portion toward the pole group is N, and satisfies 125°≤N≤145°.

7. The battery cover according to claim 1, characterized in that, The first expansion section includes a first top protective plate parallel to the first mounting section and a first side protective plate surrounding the first top protective plate. The second expansion section includes a second top protective plate parallel to the first mounting section and a second side protective plate surrounding the second top protective plate. The thickness of the first top protective plate and the second top protective plate is T1, and the thickness of the first side protective plate and the second side protective plate is T2, satisfying 0.5≤T2 / T1≤0.

9.

8. The battery cover according to claim 1, characterized in that, The cover plate body has an insertion protrusion with the same outline as the cover plate body on the inner side facing the pole group.

9. The battery cover according to claim 1, characterized in that, The first electrode module and the second electrode module have the same polarity; Alternatively, the first electrode module and the second electrode module may have different polarities.

10. A battery, characterized in that, The battery includes an electrode assembly, a battery casing, and a battery cover as described in any one of claims 1-9. The battery casing is a hollow casing structure with at least one opening, and the battery cover is disposed at the opening of the battery casing to close the battery casing and form a receiving cavity for accommodating the electrode assembly.

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